After the G7 summit, which ended on Saturday, Mr Trump effectively tore up the joint agreement.

He used Twitter to announce that he was ordering US officials not to endorse the document in response to what he claimed were "false statements" by summit host Justin Trudeau.

During the summit, Mr Trump accused other states of "robbing" his country through their trade policies and proposed scrapping tariffs across the G7.

The PM said the UK stands by its commitments after a "difficult" G7 summit (Image: Parliament Live)

And in his tweet after departing Charlevoix, he wrote: "Based on Justin's false statements at his news conference, and the fact that Canada is charging massive Tariffs to our U.S. farmers, workers and companies, I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market!"

She responded, telling MPs that she wanted to ensure a "continued dialogue" going forward.

She told MPs: "I was very clear, I've been clear directly to President Trump, I've been clear in this House and elsewhere; these tariffs are unjustified and the European Union will take counter measures on this.

"What we want to ensure is that we're able to get a dialogue going forward such that we don't simply see a continuous tit-for-tat escalation on these measures because that is in the interests of nobody."

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Donald Trump blamed Justin Trudeau for the US's decision not to sign the communique (Image: REUTERS)

The Prime Minister pointedly paid tribute to the work of the Canadian PM who hosted the summit in reference to tweets from Donald Trump which blamed Justin Trudeau for the US's decision to walk away from the agreed communique.

Labour leader Jeremy Corbyn told MPs: "The G7 meeting can only be described as a failure and the blame for that lies with the current inhabitant of the White House."

While the SNP leader in Westminster Ian Blackford described the summit as a "diplomatic disaster".

And Liberal Democrat leader Vince Cable asked the Prime Minister: "What is the point of the G7?" since the most powerful member, the US, does not believe in a rules-based system and India and China are not involved. He asked if it should be closed down.

Earlier today the government said it expected the US to honour commitments made at the G7 summit in Canada, despite Donald Trump's refusal to sign the agreement.

"The European Commission sticks to the final declaration communique and will take all the necessary action at our level to achieve and promote the objectives set therein.

"For us, pacta sunt servanda. After two days of intense negotiations and an even longer preparatory process at sherpa level, the text reflects the values and policies that the EU stands for and that we will continue together with our partners to defend."